A simple eye-like structure found in certain animals like worms or algae, or a dark marking on an animal's body that resembles an eye.
From 'eye' + 'spot.' A naturalistic compound coined in the 18th-19th centuries by biologists to describe eye-like sensory organs in invertebrates and microorganisms.
Many creatures have eyespots that aren't real eyes at all—some butterflies have fake eyespots on their wings to scare predators, showing evolution's clever way of saying 'watch out' without needing an actual eye!
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